One (nearly) last question: I'm doing this in place on the boat with the line through the furler and blocks. Anything I should do in that case to avoid getting a twist in it?

Thanks for going above and beyond.

Tom

Look at the color flecks in the line, you can see it if you have a lot of twist.
If it's solid white or a solid colored line it is still possible to see the twist, just a little harder.
After you run it through the furler and the lead blocks, just take a couple moments to untwist it.